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Full-Text Articles in Life Sciences
Abundance And Distribution Of Herbaceous Angiosperms In Grass-Sedge Marshes Of West-Central Florida: The Effect Of Seasonal Water-Level Fluctuation, Pamela S. Botts
Abundance And Distribution Of Herbaceous Angiosperms In Grass-Sedge Marshes Of West-Central Florida: The Effect Of Seasonal Water-Level Fluctuation, Pamela S. Botts
USF Tampa Graduate Theses and Dissertations
Grass-sedge marshes in west-central Florida were studied to determine the abundances and distributions of herbaceous angiosperms. Cluster analysis, reciprocal averaging, and a biotic boundaries technique were used to analyze the relationship between community composition and depth within the marsh. Shallow areas were dominated by Rhynchospora filifolia, Dichanthelium sabulorum, and Rhynchospora cephalantha. Abundances of the species fluctuated seasonally and varied between marshes. Deep areas of individual marshes differed markedly from shallow areas and from each other. A deep, well-drained marsh supported a monospecific stand of Juncus repens, while a less deep, but poorly drained marsh had a …
Distribution And Molecular Weight Of Dissolved Dna In Subtropical Estuarine And Oceanic Environments, Mary F. Deflaun, John H. Paul, Wade H. Jeffrey
Distribution And Molecular Weight Of Dissolved Dna In Subtropical Estuarine And Oceanic Environments, Mary F. Deflaun, John H. Paul, Wade H. Jeffrey
Marine Science Faculty Publications
Dissolved DNA and a series of microbial biomass and activity parameters were measured in offshore, coastal, estuarine and coral reef environments of the southeast Gulf of Mexico. Oceanic concentrations of dissolved DNA ranged from 0.2 to 19 μg 1-1 and decreased as a function of distance from shore and depth in the water column. Dissolved DNA concentrations were greater than half the particulate DNA content in offshore environments (̄x̄ = 63 ± 45 %) but were a smaller percentage of particulate DNA in nearshore and estuarine environments (̄x̄ = 35 ± 21 %). Dissolved DNA correlated better with bacterial …
Velocity And Temperature Observations During The Seasonal Response Of The Equatorial Atlantic Experiment At 0 Degrees, 28 Degrees W, Robert H. Weisberg, J. H. Hickman, T. Y. Tang, T. J. Weingartner
Velocity And Temperature Observations During The Seasonal Response Of The Equatorial Atlantic Experiment At 0 Degrees, 28 Degrees W, Robert H. Weisberg, J. H. Hickman, T. Y. Tang, T. J. Weingartner
Marine Science Faculty Publications
Continuous 2.7‐year time series of upper ocean currents and temperature at 0°, 28°W collected during the Seasonal Response of the Equatorial Atlantic Experiment are presented. The thermocline underwent distinctive annual cycles in response to forcing by the surface wind stress, and the core of the Equatorial Undercurrent tracked the thermocline. While the vertical position of the thermocline and the undercurrent appear to be simply related, the transport of the undercurrent did not show a replicating annual cycle, and the speed at the undercurrent core remained relatively constant. Near surface flow when averaged over the 2.7 years was not statistically different …
M2 Tidal Currents In The Eastern Equatorial Pacific Ocean, Robert H. Weisberg, D. Halpern, T. Y. Tang, S. M. Hwang
M2 Tidal Currents In The Eastern Equatorial Pacific Ocean, Robert H. Weisberg, D. Halpern, T. Y. Tang, S. M. Hwang
Marine Science Faculty Publications
Current meter measurements recorded over the water column at 10 depths ranging from 20 m to 3027 m using surface and subsurface moorings near 0°, 110°W are analyzed for the M2 tidal current over a 10‐month sampling interval. A kinematical description is given by month and depth, followed by a decomposition into a barotropic mode and three baroclinic modes. The barotropic tide was dominant, and its hodograph was stable over the 10 months sampled. The baroclinic tide was random, isotropic, and without mode preference.
Further Studies On The Response Of The Equatorial Thermocline In The Atlantic Ocean To The Seasonally Varying Trade Winds, Robert H. Weisberg, T. Y. Tang
Further Studies On The Response Of The Equatorial Thermocline In The Atlantic Ocean To The Seasonally Varying Trade Winds, Robert H. Weisberg, T. Y. Tang
Marine Science Faculty Publications
Upper ocean temperature data obtained during the Seasonal Response of the Equatorial Atlantic experiment and the Francais Ocean et Climat dans l'Atlantique Equatorial program are used to describe the variations of the thermocline observed along the equator from February 1983 to September 1984. In response to rapid seasonal changes in zonal wind stress, the thermocline underwent sequences of upwelling followed by downwelling or conversely, depending upon whether the winds were intensifying or relaxing. These sequences increased systematically in magnitude and duration to the east. Both the sequential behavior and its zonal inhomogeneity represent departures from the slowly varying and in-phase …
A Bias In The Satellite-Observed Low-Level Cloud Motion Winds Over The Central Tropical Pacific, Gary T. Mitchum
A Bias In The Satellite-Observed Low-Level Cloud Motion Winds Over The Central Tropical Pacific, Gary T. Mitchum
Marine Science Faculty Publications
Island wind data from the central tropical Pacific are compared with satellite-observed low-level cloud motion winds over the same area during 1976–1980. The purpose of the comparison is to investigate the effect of gaps in the satellite wind series. It is found that the distribution of the gaps is such that the resulting time series is biased from the complete time series because of undersampling of the strongest westerly and northerly wind anomalies. This bias is strong enough, at least in this geographical region, to cause difficulties in estimating accurate mean fields from the cloud motion winds alone. The gaps …
Trade Wind Fluctuations Associated With El Niño-Southern Oscillation Events, Gary T. Mitchum
Trade Wind Fluctuations Associated With El Niño-Southern Oscillation Events, Gary T. Mitchum
Marine Science Faculty Publications
Wind fields associated with El Niño-Southern Oscillation (ENSO) events are investigated using 20 years (1965–1984) of monthly mean wind vectors along a ship track from 30°S to 30°N in the western Pacific Ocean. The analysis shows that off-equatorial trade wind fluctuations play a significant role in ENSO events. In particular, the meridional component is found to have strong deviations during ENSO events. Southerly deviations from the mean meridional field are noted during the ENSO events of 1965, 1972, 1976, and 1982. The trade wind deviations are consistent with atmospheric convergence into an equatorial convection region to the east of the …
What Controls Tropical Reef Fish Populations: Recruitment Or Benthic Mortality? An Example In The Caribbean Reef Fish Haemulon Flavolineatum, M. J. Shulman, John C. Ogden
What Controls Tropical Reef Fish Populations: Recruitment Or Benthic Mortality? An Example In The Caribbean Reef Fish Haemulon Flavolineatum, M. J. Shulman, John C. Ogden
Integrative Biology Faculty and Staff Publications
Recruitment from a planktonic larval stage has been proposed to be an important factor in limiting populations of marine organisms, particularly tropical reef fishes. We monitored recruitment and population densities of juvenile size classes In French grunt Haemulon flavolineatum (Haemulidae) from October 1978 through December 1980 In a portion of Tague Bay, St. Croix, U. S. Virgin Islands. Within our study area, 95 % of new recruits settled onto the sand and seagrass lagoon floor and within a few weeks migrated to nearby reefs; the remaining 5'10 settled directly onto reef structures. Mean annual recruitment rate was 1.8 recruits per …